Brake Recommendation

I have a set of Flo 30 and I have fount the rear wheel rubs the brake pads when I have to get out of the saddle on steep climbs. I have Tektro R580 brakes and have adjusted them out as wide as possible. Do you have an brake recommendations that might work better.

I have a set of Flo 30 and I have fount the rear wheel rubs the brake pads when I have to get out of the saddle on steep climbs. I have Tektro R580 brakes and have adjusted them out as wide as possible. Do you have an brake recommendations that might work better.

Thanks for writing. Can I ask if the brakes are rubbing on both sides or just one?